https://bugs.winehq.org/show_bug.cgi?id=55810
--- Comment #6 from Zeb Figura z.figura12@gmail.com --- (In reply to Béla Gyebrószki from comment #5)
(In reply to Zeb Figura from comment #4)
Wait, so in the broken case the virtual desktop itself is missing its decorations? That's bizarre, I have no idea how that's even possible.
Yes, that's what I was trying to describe with my limited English knowledge :)
Nah, your description makes sense in retrospect, I just would not have assumed that's even possible.
Anyway, I think I managed to have reproduced one of the symptoms Andrey mentioned? Currently, starting Steam in a 800x600 desktop will result in a Steam window larger than the virtual desktop; with 245bdef5b1 reverted it resizes itself to 800x600. I'll investigate the source of that and see if fixing it fixes anything else.